LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Aging analysis of recorded investments by class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 6,099	$ 6,362
Total current	1,597,284	1,527,823
Total Recorded Investment	1,603,383	1,534,185
90 days past due and accruing interest	0	0
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,210	2,785
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,536
90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,353	3,577
Cash, Securities and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	781	800
Total current	293,056	356,220
Total Recorded Investment	293,837	357,020
Cash, Securities and Other | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	727	752
Cash, Securities and Other | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	14
Cash, Securities and Other | 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	40	48
Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,522
Total current	129,619	131,111
Total Recorded Investment	132,141	131,111
Construction and Development | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,522
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	566	1,283
Total current	501,873	453,755
Total Recorded Investment	502,439	455,038
1-4 Family Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	483	1,283
1-4 Family Residential | 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	83
Non-Owner Occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current	358,369	281,943
Total Recorded Investment	358,369	281,943
Owner Occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		479
Total current	167,638	162,563
Total Recorded Investment	167,638	163,042
Owner Occupied CRE | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		479
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,230	3,800
Total current	146,729	142,231
Total Recorded Investment	148,959	146,031
Commercial and Industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		271
Commercial and Industrial | 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 2,230	$ 3,529